Frontier .223 Rem 55 Grain Centerfire Rifle Ammo provides shooters with military-grade ammunition, available in a wide choice of Hornady bullets. State-of-the-industry manufacturing techniques and tight quality control procedures ensure reliably consistent ignition, velocity, and function in semi-auto actions. Frontier Centerfire Rifle Ammo is loaded with military-grade boxer primers and propellant, and reloadable brass cases. Military-grade ammunition Loaded with Hornady bullets Reliably consistent velocities Reloadable brass cases